1“Cry aloud! Don’t spare!
Lift up your voice like a trumpet!
Declare to my people their disobedience,
and to the house of Jacob their sins.
2Yet they seek me daily,
and delight to know my ways.
As a nation that did righteousness,
and didn’t forsake the ordinance of their God,
they ask of me righteous judgments.
They delight to draw near to God.
3‘Why have we fasted,’ they say, ‘and you don’t see?
Why have we afflicted our soul, and you don’t notice?’
“Behold, in the day of your fast you find pleasure,
and oppress all your laborers.
4Behold, you fast for strife and contention,
and to strike with the fist of wickedness.
You don’t fast today so as to make your voice to be heard on high.
5Is this the fast that I have chosen?
A day for a man to humble his soul?
Is it to bow down his head like a reed,
and to spread sackcloth and ashes under himself?
Will you call this a fast,
and an acceptable day to Yahweh?
6“Isn’t this the fast that I have chosen:
to release the bonds of wickedness,
to undo the straps of the yoke,
to let the oppressed go free,
and that you break every yoke?
7Isn’t it to distribute your bread to the hungry,
and that you bring the poor who are cast out to your house?
When you see the naked,
that you cover him;
and that you not hide yourself from your own flesh?
8Then your light will break out as the morning,
and your healing will appear quickly;
then your righteousness shall go before you,
and Yahweh’s glory will be your rear guard.
9Then you will call, and Yahweh will answer.
You will cry for help, and he will say, ‘Here I am.’
“If you take away from among you the yoke,
finger pointing,
and speaking wickedly;
10and if you pour out your soul to the hungry,
and satisfy the afflicted soul,
then your light will rise in darkness,
and your obscurity will be as the noonday;
11and Yahweh will guide you continually,
satisfy your soul in dry places,
and make your bones strong.
You will be like a watered garden,
and like a spring of water
whose waters don’t fail.
12Those who will be of you will build the old waste places.
You will raise up the foundations of many generations.
You will be called Repairer of the Breach,
Restorer of Paths with Dwellings.
13“If you turn away your foot from the Sabbath,
from doing your pleasure on my holy day,
and call the Sabbath a delight,
and the holy of Yahweh honorable,
and honor it,
not doing your own ways,
nor finding your own pleasure,
nor speaking your own words,
14then you will delight yourself in Yahweh,
and I will make you to ride on the high places of the earth,
and I will feed you with the heritage of Jacob your father;”
for Yahweh’s mouth has spoken it.
Jacob was the son of Isaac and Rebekah, born immediately after Esau, and Abraham was his grandfather. He achieved the right of the firstborn by trickery, in offering his older brother, Esau, food in exchange for the birthright, who cared little for this position. He also received the blessing of firstborn from his father Jacob before his death by cunning, and with the assistance of his mother Rebekah.
After his deception of Esau, receiving the blessing from his father, Jacob escaped to his uncle Laban, who in turn deceived Jacob into working for fourteen years for the marriage of Jacob to Leah, and then his beloved Rachel. Laban also sought to deceive Jacob of wages, but God intervened to ensure he would prosper. In a time of trial, when he feared the wrath of Esau, upon returning to the land of Canaan, Jacob had an encounter with God, and his name was changed to Israel, the one who wrestles with God. Even though his early life was characterized by deception, God worked through the situation to ensure that Jacob would be the one in the line of the patriarchs, to create a great nation and ultimately fulfill His purposes in the earth, especially through the future Messiah. The Messiah would guarantee the promise of the land to Abram and a person who would rule over Abraham's descendants, but also He would bring blessings to all the people of the earth (Gen 12:1-3).
In spite of Jacob's early failure by deception, God worked through him, and finally, Jacob became a different type of man after his struggle with God. As one has said,
"Despite Jacob’s faults, God chose him to be the leader of a great nation that still bears his name today. But for this, it is unlikely that we would know much about Jacob, who appears to be in the middle of events while the key players are those around him. There is no great wisdom or bravery in Jacob to speak of, and we are tempted to see him as little more than God’s passive instrument. If we are tempted to think that, because we aren’t in the spotlight performing great acts for God, we are unimportant to Him, then we should consider the life of Jacob and know that, in spite of our failings, God can and will still use us in His plan."
For more on Jacob, see "Who was Jacob in the Bible?", https://www.gotquestions.org/life-Jacob.html